Strikers have been locked out of work and there were arrests of workers in April.

Additionally, petrochemical workers from Gachsaran in south-west Iran were on strike against non-payment of wages earlier this week.

Iran's currency has plummeted recently due to US sanctions. This is steeply affecting living standards, already a major trigger of the strikes and protests earlier this year, during which a slogan was Bread, Jobs, Freedom.

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